95 lines
2.4 KiB
JavaScript
95 lines
2.4 KiB
JavaScript
import React, { useState, useEffect, useRef } from 'react';
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import PropTypes from 'prop-types';
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import hark from 'hark';
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import Styled from './styles';
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const VOL_POLLING_INTERVAL_MS = 100;
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const VOL_FLOOR = 0;
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const VOL_CEIL = 50;
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const DB_AMPL = 65;
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const propTypes = {
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stream: PropTypes.object,
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volumePollingInterval: PropTypes.number,
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volumeFloor: PropTypes.number,
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volumeRange: PropTypes.number,
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optimum: PropTypes.number,
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high: PropTypes.number,
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};
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const AudioStreamVolume = ({
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volumeFloor,
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volumeRange,
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low,
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optimum,
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high,
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stream,
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}) => {
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const harkObserver = useRef(null);
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const volumeRef = useRef(0);
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const [volume, setVolume] = useState(0);
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useEffect(() => {
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observeVolumeChanges();
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return stopObservingVolumeChanges;
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}, [])
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useEffect(() => {
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stopObservingVolumeChanges();
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observeVolumeChanges(stream);
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}, [stream]);
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const observeVolumeChanges = (_stream) => {
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if (_stream) {
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harkObserver.current = hark(_stream, { interval: VOL_POLLING_INTERVAL_MS });
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harkObserver.current.on('volume_change', handleVolumeChange);
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}
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}
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const stopObservingVolumeChanges = () => {
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harkObserver.current?.stop();
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harkObserver.current = null;
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}
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const handleVolumeChange = (dbVolume) => {
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const previousVolume = volumeRef.current;
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// Normalize it into 0 - range . DB_AMPL is the "relevance factor" -
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// original formula is / 20
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const linearVolume = Math.pow(10, dbVolume / DB_AMPL) * (volumeRange);
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// If the current linear volume is lower than 1/10 of the total volume range,
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// ignore to minimize re-renders. Otherwise: generate the next volume val
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// by smoothing the transition with the previous value and rounding it up
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const nextVolume = (linearVolume <= (volumeRange / 10))
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? volumeFloor
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: Math.round((0.65 * previousVolume) + (0.35 * linearVolume));
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if (previousVolume !== nextVolume) {
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volumeRef.current = nextVolume;
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setVolume(nextVolume);
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}
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}
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return (
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<Styled.VolumeMeter
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min={volumeFloor}
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low={low}
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max={high * 1.25}
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optimum={optimum}
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high={high}
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value={volume}
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/>
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);
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}
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AudioStreamVolume.propTypes = propTypes;
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AudioStreamVolume.defaultProps = {
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volumeFloor: VOL_FLOOR,
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volumeRange: VOL_CEIL,
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low: VOL_FLOOR,
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optimum: Math.round(0.3 * VOL_CEIL),
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high: Math.round(0.4 * VOL_CEIL),
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stream: null,
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};
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export default React.memo(AudioStreamVolume);
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